A pure traditional Chinese medicine for drug withdrawal and a preparation method thereof. The medicine is made of the following raw materials: astragalus, polygala, codonopsis, ginseng, baiziren, Fushen, jujube seed, uncaria, corydalis, salvia, frankincense (made) . The raw materials are processed by crushing or slicing, extracting, concentrating, drying, mixing, forming and other processes by modern technology. This drug has the functions of strengthening the body, nourishing qi and calming the nerves, relieving spasm and relieving pain, calming convulsions and quenching wind, and regulating yin and yang. It is clinically suitable for all patients who are poisoned by taking heroin and its derivatives or methamphetamine and its derivatives. And eliminate the withdrawal symptoms of opioid drugs, especially methamphetamine drugs (ice, magu, K powder, ecstasy, etc.), and relieve drug addiction. More than 3,000 clinical trials have shown that the curative effect of detoxification is obvious, and it is safe to use according to the recommended dose, without toxic and side effects, and can be applied clinically.